How can i make a translucent material on Cycles?
I would use a subsurface scattering (SSS) shader (rather than a translucent shader) mixed with a diffuse/glossy shader mix (or whatever you are using for the base surface shader).

SSS basically makes the rays scatter when they hit the surface of an object, meaning the rays don't come off the surface at the same place they hit it.  The amount of scattering is determined by the scattering radius multiplied by the scale value on the shader.  SSS is usually used for organic things such as skin.

You can check out this question and this question and the documentation to learn more about SSS.